Assertion :During anaphase, centromere of each chromosome splits to the chromatids separate. Reason: During anaphase, chromatids move to opposite poles.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In anaphase, chromosomes are arranged on the equatorial plate for a short period. In anaphase centromeres of chromosomes start to divide into two, forming daughter chromatids with centromere in each. Daughter chromosomes are repulsive so, migrate towards opposite poles. Spindle fibres attached to the centromeres shorten and pull the chromosomes to the poles. In anaphasic movement of chromosomes, the centromeres lead the path while the limbs trail behind. So anaphasic chromosomes appear as V-, L-, J- and I-shaped.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

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